I had the same problem, I have to put in all energy to get projects done. But 6 weeks ago I switched to a contract that allows me working 4 days per week and I

I had the same problem, I have to put in all energy to get projects done. But 6 weeks ago I switched to a contract that allows me working 4 days per week and I now spend Mondays for "on the side" work. So far it's rather refreshing and motivating, but will have to see how it works out in the long run. And it's certainly 20% less money - so also not something everyone will do I guess.